Apparatus for withdrawing rapidly moving yarn material

ABSTRACT

An apparatus for withdrawing or sucking off rapidly moving yarn material comprising a suction bore, an approximately cylindrical compartment into which the suction bore opens approximately coaxially and which possesses a larger diameter relative thereto. A compressed air channel opens into the cylindrical compartment. The compressed air channel enters approximately tangentially into such cylindrical compartment.

United States Patent [191 Gasser et al.

APPARATUS FOR WITHDRAWING RAPIDLY MOVING YARN MATERIAL Inventors:Hermann Gasser, Zurich; Imre Plezer, Greifensee, both of SwitzerlandAssignee: Luwa AG, Zurich, Switzerland Filed: June 12, 1972 Appl. No.:261,737

Foreign Application Priority Data June 18, I971 Switzerland 8909/71 US.Cl ..226/97, 28/1.4

Field of Search 226/7, 97; 28/l.4

References Cited UNITED STATES PATENTS Bell et al 28/].4 X

[451 Jan. 1, 1974 r 3,452,910 7/l969 Richter .r 226/97 X PrimaryExaminer-Allen NnKnowles Assistant Examiner-Gene A. ChurchAttorney-Werner W. Kleeman [57] v ABSTRACT An apparatus for withdrawing0r sucking off rapidly moving yarn material comprising a suction bore,an approximately cylindrical compartment into vwhich the suction boreopens approximately coaxially and which possesses a larger diameterrelative thereto. A compressed air channel opens into the cylindricalcompartment. The compressed air channel enters approximatelytangentially into such cylindrical compartment.

5 Claims, 1 Drawing Figure APPARATUS FOR WITHDRAWING RAPIDLY MOVING YARNMATERIAL BACKGROUND OF THE INVENTION The present invention relates to anew and improved construction of apparatus for sucking off orwithdrawing rapidlymoving yarnmaterial. The termyarn material" as usedin the context of this application is not em- ,ployed in any limitingsense, rather is intended to encompass most types of filamentarymaterial, such as threads, yarns,.and the like.

The prior art is familiar with equipment for sucking off rapidly movingyarn material which functions according to the principles of aninjector. To this end there is provided a suction conduit guiding theyarn, thesuction conduit opening into awidened cylindrical compartmentand issurrounded by a ring-shaped discharge or jet nozzle which flowcommunicates with a compressed air source. Compressed air is deliveredby means of a radially extending channel into the annular compartmentopening at the jet nozzle.

Equipmentof this type enables the sucking off or withdrawal of yarnstravelling at speeds exceeding 3,500 m/min. Yet, such typestateof-the-art equipment only produces a relatively slight tensionalforce. Hence,

it can be onlysuccessfully employed in those situations where the yarnis sucked off without practically any deflection and wherethere is nodanger that the yarn will become caught at rotating components owing tothe absence of a sufficient pulling or tensile load.

SUMMARY OF THE INVENTION Hence, from what has been explained above, it

should be recognized that this particular field of technology is stillin need of equipment for withdrawing or sucking off rapidly moving yarnmaterial in a manner not associated with the aforementioned drawbacksand limitations of the heretofore discussed proposals of the prior art.It is therefore a primary object of the present invention to provideapparatus suitable for this purpose which successfully and reliablyfulfills the existing need .in the art. I

Still a further significant object of the present invention relates toan improved apparatus for sucking off rapidly, moving yarn materialwhich is capable of exerting a sufficient tension force at the yarnmaterial.

Yet another important object of the present invention relates to animproved construction of apparatus .only. after experiencing acommingling action. Conse quently, the solution proposed by theinvention is predicated upon the features of generating a spin or twistflow in the cylindrical compartment by means of compressed air andpermitting the yarn material, centrally introduced through the suctionconduit, from being carried out of the core zone by the spin flow anddirectlysubjected. to the actionof such spin flow.

Now, in orderto implement the aforementioned objects and others whichwill become more readily apparent as the description proceeds, and forthe purpose of realizing a construction of apparatus suitable for theintended purposes, the inventive apparatus embodies a suction bore, anapproximately cylindrical compartment into which approximately coaxiallyopens the suction bore and which compartment possesses a larger diameterthan the suction bore. Further, there is pro vided a compressed airchannel which opens into this cylindrical compartment, the compressedair channel entering approximately tangentially into the cylindricalcompartment.

According to a further aspect of the invention, the position of themouth of the compressed air channel at the cylindrical compartment withrespect to the plane containing the mouth of the suction bore is offsetdownstream with respect to the direction of flow, i.e., also with regardto the direction of movement of the yarn material.

BRIEF DESCRIPTION OF THE DRAWING The invention will be better understoodand objects other than those set forth above, will become apparent whenconsideration is given to the following detailed description thereof.Such description makes reference to the annexed drawing wherein thesingle FIGURE illustrates in longitudinal sectional view an exemplary:embodimentof inventive apparatusfor withdrawing or sucking-off rapidlymovingyam material.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS l Describing now thesingle FIGURE of the drawing, it is to be understood that the exemplaryillustrated apparatus constitutes a piece of equipment intended to beinstalled at the winding locations or stations of a texturizing machinein which there can be randomly processed right-hand or left-handtwistedyarn. To this end reference numeral 2 designates a housing bodywhich can be secured in any convenient manner, therefore notparticularly shown, to the winding location ors tation. A longitudinalor lengthwise extending bore 4 completely extends through the housingbody 2. Bores 6, 8 and 10 provided at the housing body 2 open into thelongitudinal bore 4 in a direction substantially perpendicular thereto.The bores 6 and 8 are connected via conduits l4 and 16 with a suitablesuction installation 12. constituting part of the texturizing machine.The bore 10 arranged between the bores 6 and 8 is con- While the one endof the longitudinal bore 4 is closed orcovered by a suitable covermember 22, aninsert24 extends into the longitudinal bore 4 from theopposite end of the housing body 2. This insert 24 embodies a sleevemember 26 which incorporates a tapered central portion 28 and a taperedend portion 30. The tapered central portion 28 together with the innerwall of the longitudinal bore 4 delimits a compartment 32 which flowcommunicates with the bore 10 and issealed by means of sealing O-rings34 inserted at both ends of the central portion 28 into the sleevemember 26, as shown. The sleeve member 26 is retained in the axialdirection within the housing body 2 by means of an ad- I justing screw36 which engages with a peripheral groove 38 provided at such sleevemember 26.

At the tapered end portion 30 of the sleeve member 26 there is providedan elongate hole 40 through which nected via a conduit .18 with acompressed air source extends an entrainment screw 42. The entrainmentscrew 42 is inserted into a gripping or operating element 44 which isdisplaceably guided at the tapered end portion 30. By means of theentrainment screw 42 the gripping element 44 is connected with a suctionconduit or pipe 48 which is seated in a bore 46 of the sleeve member 26and for the purpose of accommodating the end of the entrainment screw 42is provided with a circumferential groove 54. The suction conduit 48contains an axially extending suction bore 50 with a substantiallytrumpet-shaped inlet 52. The discharge mouth or outlet 58 of the suctionbore 50 is located at a stepped end portion or mouthpiece 56 of thesuction conduit 48. A compressed air channel 60 opens into the sleevebore 46, this compressed air channel 60 being offset downstream in thedirection of flow by a small amount with regard to the outlet or mouth58. Moreover, the axis of the compressed air channel 60 extendsapproximately tangentially with regard to the wall of the sleeve bore46.

Now, within the sleeve bore 46 the suction conduit 48 can be displacedout of its full line illustrated termi nal position together with thegripping or operating element 44 into the phantom line illustratedterminal position. The extension of the elongate hole 40, limiting thedisplacement path, is selected such that two O-rings 62 inserted intothe suction conduit 48 come to rest at both sides of the compressed airchannel 60, whereas the mouth thereof is covered by the suction conduit48 when such is located in the phantom line illustrated terminalposition.

The cylindrical compartment 64 formed by the sleeve bore 46 and thedischarge end or mouth 58 of the suction conduit 48 is in flowcommunication, through the agency of a trumpet-shaped outlet 66, with acompartment 68 bounded by the longitudinal bore 4 and the cover member22, and into which compartment 68 the bore 8 opens.

Now if yarn, indicated by reference character F, is brought into theneighborhood of the suction conduit inlet 52, during which time thegripping or operating element and therefore also the suction conduit 48are located in the full line illustrated terminal position, then thisyarn is sucked up by a suction air current. This air flow forms in thesuction bore 50 under the action of the compressed air which flows fromthe tangential compressed air channel 60 into the compartment 64. If theyarn F thus arrives at the compartment 64, then it is exposed to such astrong tensional force that the travelling yarn is withdrawn in atensioned condition.

Owing to the flow prevailing in the compartments 64 and 68, the yarn Fis delivered to the bore 8 and thereafter is taken over by the conduit16 of the suction installation 12 of the equipment. Through appropriatemeans, well known in this particular art, there is insured that asufficiently high transport air velocity prevails in the conduit i6 inorder to avoid clogging or damming up of yarn. If the bobbin-changeoperation is carried out, which for instance constituted a reason forresorting to the use of the apparatus, then the yarn travelling into theapparatus is deposited in the form of a loop upon the rotating newbobbin sleeve and the yarn connection to the apparatus and namely to thesuction conduit 48 is severed by any suitable and therefore notparticularly illustrated cutting device. If the appropriate yarn end hasbeen completely grasped by the apparatus, then, by displacing theoperating or gripping element 44 into the phantom line position, theinfeed of compressed air from the compartment 32 can be interrupted andtherefore the apparatus can be placed out of operation.

Although the apparatus as shown in the illustrated assembled position ofthe insert 24, is designed for operation with left-hand twisted yarns,such can be converted most simply for processing right-hand twistedyarns. To this end, the screw 36 is released to such an extent that thesleeve member 30 is freed, and the insert 24 is withdrawn out of thelongitudinal bore 4. Thereafter the cover member 22 is inserted from theleftside into the longitudinal bore 4. In its place there is inserted atthe right-hand side of the housing, the insert member 24 into thelongitudinal bore 4 and by means of the previously loosened screw 37such is secured in a mirror-image reversed position. In this positionthe bore 10 is again in flow communication with the compartment 32,whereas the compartment 64 communicates via a compartment correspondingto the compartment 68 with the bore 6 instead of with the bore 8.However, even in this position of assembly of the insert member 24 theconnection to the suction installation 12 is realized through the agencyof the conduit 14.

Measurements undertaken at different apparatus constructions designedaccording to the teachings of this invention have shown that theinventive principles have produced surprisingly high tensional forces atthe running or travelling yarns, something which is desired for thedisturbance-free withdrawal of yarns from the work zone of thetexturizing equipment.

Measurements carried out for instance with the illustrated apparatus andwith a textured yarn 30/10 denier have resulted in a tension of 5 gramswith a delivery speed of 120 m/min. The apparatus was furnished withcompressed air from the compressed air source at 5 atmospheres absolutepressure and there prevailed an air consumption of 250 N liters/min.

The more important dimensions of the apparatus are given by way ofexample hereinafter:

l. Suction conduit 48 Diameter (4)) of the suction bore 50 3 mm Lengthof the suction bore 50 50 mm Length of the end portion 56 2 mm 2.Compartment 64 2 Inner diameter 7 mm Length mm Spacing of the axis ofthe channel 60 from the plane of the mouth 58 2 mm Bore diameter of thechannel 60 2 mm 3. Compartment 68 2 Inner diameter 14 mm Spacing of theaxis of the bore 8 from the end of the compartment 64 24 mm Diameter ofthe bore 8 10 mm Comparative tests have shown'that the inventiveapparatus, in most instances, produces a considerably larger tensionalforce than an injection mechanism operated under the same conditions andwhere the compressed air channel opens into an axially directeddischarge nozzle.

The higher tensional forces which prevail for the inventive apparatusare present owing to the fact that a pronounced spin or twist flowexists in the compartment 64 which subjects the yarn in the core zonethereof and coming out of the suction bore to a revolvembodiments of theinvention, it is to be distinctly understood that the invention is notlimited thereto, but may be otherwise variously embodied and practicedwithin the scope of the following claims. Accordingly,

What is claimed is: 1. An apparatus for withdrawing rapidly moving yarn1 material, comprising means defining a suction bore,

said means defining said suction bore comprising a displaceable suctionconduit, an approximately cylindrical compartment, said suction boreopening approximately coaxially into said cylindrical compartment, saidcylindrical compartment possessing a diameter which is larger than thediameter of the suction bore, a compressed airchannel openingapproximately tangentially into said cylindrical compartment, a sleevemember containing said compressed air channel, said suction conduitbeing displaceable between two positions within said sleeve member, andwherein in one of said positions the suction conduit closes thecompressed air channel.

2. The apparatus as defined in claim 1, wherein the point of opening ofthe compressed air channel at the cylindrical compartment with regard toa plane containing the mouth of the suction bore is offset downstream inthe direction of flow, and said point of opening defining the otherposition of the displaceable suction conduit. 1

3. The apparatus as defined in claim 1, further including a mouthpieceprovided at said suction conduit and at which terminates the suctionbore, said mouthpiece extending into the cylindrical compartment.

4. The apparatus as defined in claim 1, further in cluding a suctioninstallation and a compressed air source, a housing having means forconnecting the cy lindrical compartment with the suction installationand the compressed air channel with the compressed air source. 1 i

5. An apparatus for withdrawing rapidly moving yarn material, comprisingmeans defining a suction bore, an approximately cylindrical compartment,said suction bore opening approximately coaxially into said cylin dricalcompartment, said cylindrical compartment possessing a diameter which islarger than the diameter of the suction bore, a compressed air channelopening approximately tangentially into said cylindrical, compartment,means for shutting-off the compressed air chan nel, said means definingsaid suction bore comprises a suction conduit, a sleeve membercontaining said compressed air channel, said suction conduit beingdisplaceable in said sleeve member, a suction installation and acompressed air source, a housing having means for connecting thecylindrical compartment with the suction installation and the compressedair channel with the compressed air source, and wherein the suctionconduit and said sleeve member form an insert which can be selectivelyinserted into one of two positions in the housing.

1. An apparatus for withdrawing rapidly moving yarn material, comprisingmeans defining a suction bore, said means defining said suction borecomprising a displaceable suction conduit, an approximately cylindricalcompartment, said suction bore opening approximately coaxially into saidcylindrical compartment, said cylindrical compartment possessing adiameter which is larger than the diameter of the suction bore, acompressed air channel opening approximately tangentially into saidcylindrical compartment, a sleeve member containing said compressed airchannel, said suction conduit being displaceable between two positionswithin said sleeve member, and wherein in one of said positions thesuction conduit closes the compressed air channel.
 2. The apparatus asdefined in claim 1, wherein the point of opening of the compressed airchannel at the cylindrical compartment with regard to a plane containingthe mouth of the suction bore is offset downstream in the direction offlow, and said point of opening defining the other position of thedisplaceable suction conduit.
 3. The apparatus as defined in claim 1,further including a moutHpiece provided at said suction conduit and atwhich terminates the suction bore, said mouthpiece extending into thecylindrical compartment.
 4. The apparatus as defined in claim 1, furtherincluding a suction installation and a compressed air source, a housinghaving means for connecting the cylindrical compartment with the suctioninstallation and the compressed air channel with the compressed airsource.
 5. An apparatus for withdrawing rapidly moving yarn material,comprising means defining a suction bore, an approximately cylindricalcompartment, said suction bore opening approximately coaxially into saidcylindrical compartment, said cylindrical compartment possessing adiameter which is larger than the diameter of the suction bore, acompressed air channel opening approximately tangentially into saidcylindrical compartment, means for shutting-off the compressed airchannel, said means defining said suction bore comprises a suctionconduit, a sleeve member containing said compressed air channel, saidsuction conduit being displaceable in said sleeve member, a suctioninstallation and a compressed air source, a housing having means forconnecting the cylindrical compartment with the suction installation andthe compressed air channel with the compressed air source, and whereinthe suction conduit and said sleeve member form an insert which can beselectively inserted into one of two positions in the housing.